Table 3.
Comparison of initial Verigene BC-GP results and standard laboratory method results for 12 blood cultures yielding multiple organismsa
| Verigene BC-GP result | No. (actual/expected) of blood cultures with Verigene results | No. (%) of Verigene results concordant with standard laboratory method results |
Sensitivity (%)b | Specificity (%)b | |
|---|---|---|---|---|---|
| Initial assay | Repeat assay | ||||
| Staphylococcus aureus | 4/4 | 4 (100) | NRc | 100 | 100 |
| Staphylococcus epidermidis | 4/3 | 4 (75) | 3 (100) | 100 | 88.9 |
| Staphylococcus spp. | 1/3 | 1 (33.3) | 1 (33.3) | 33.3 | 100 |
| Streptococcus anginosus group | 1/1 | 1 (100) | NR | 100 | 100 |
| Streptococcus spp. | 2/2 | 2 (100) | NR | 100 | 100 |
| Enterococcus faecalis | 3/3 | 3 (100) | NR | 100 | 100 |
| Enterococcus faecium | 1/1 | 1 (100) | NR | 100 | 100 |
| mecA | 6/3 | 6 (50) | 5 (60) | 100 | 66.7 |
| vanA | 2/2 | 2 (100) | NR | 100 | 100 |
a
BC-GP, Gram-positive blood culture.
b
Sensitivity and specificity values were based on the initial Verigene results.
c
NR, no repeat of the Verigene assay was required for this organism group.